Simple Explicit Multicast (SEM)
In this document, we propose a new multicast protocol called SEM (Simple Explicit Multicast) or simple Xcast. This protocol uses an efficient method to construct the multicast tree and deliver multicast packets. In order to construct the multicast tree, this protocol uses the same mechanism as Xcast+. For the delivery of multicast packets it uses the mechanism of branching routers similar to the mechanism used in REUNITE I and REUNITE II.